Improvement in tilting chairs



s; Herr-MAN.

irv.

Tilting-cha No.l68,744.

Patented 0ct.11, 1875.

INVENTUH. www' M MPE-TENS. PHDTc-LITHOGRAFHER. WASHINGTbN. D C.

UNTTED STATES PATENT GFFICE.

SEBASTIAN HOFFMAN, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN TILTING CHAIRS.

Specification forming part of Letters Patent No. 168.744, dated Octoberl1, 1875; application filed June 21, 1875.

To all whom it may concern:

Be it known that I, SEBASTIAN HOFFMAN, of St. Louis, St. Louis county,State of Missouri, have invented a certain new and useful Improvement inTilting Chairs, of which the following is a specification:

This invention is an improvement on the tilting chair patented to meJanuary 5, 1875, (No. 158,492.) My present improvement relates to theconstruction of the spring 'audits attachments. The spring consists of asingle rod with two coils, whose ends extend back in arms which havehearing beneath the back of the seat-trame. Between the coils is astirrup, which is over the back bar or arm of the spider, and whichbears against a lug` extending upward from thearm. The coils of thespring are in recesses somewhat similar to those of my former patentedchair, but more particularly intended to prevent the upward movement ofthe coils.

A In the drawings, Figure 1 isa perspective view of the chair with theseat removed, to expose the novel features of construction, the Viewbeing taken from the front side. Fig. 2 is a back perspective view ofthe chair-irons complete, on au enlarged scale. Fig. 3 is a perspectiveview of the spring on a scale still more enlarged.

The legs are shown at A. The upper ends of the legs are mortised, asusual, into the fixed nut B. G is the vertical screw turning in the nutB. The spider has front arm D and side arms E E, similarto those of myformer patented chair. The rear arm F of the spider has upon its upperside a lug or catch, G, against which bears the stirrup H of the spring.YThe said stirrup straddles the arm F, and has at each side of the arm acoil, I, which terminates in a straight spring-arm, K, which has anupward bearing against the back of the seat-frame, the arms K having endmovement, as the chair is tilted, in their bearings in the bearing-plateM, similar to that of H of my former patent. N is a flange projectingfrom the middle of the spider above the coils, to prevent the rocking ofthe stirrup on the arm F. The spring 'H I K tends` to tilt the seatforward against the stop-arm D, the arm F forming a stop to the backwardtilting ot' the seat.

I claim herein as my invention- The combination ot' spider D E F andseat L with the spring consisting of stirrup H, coils l I. and arms K K,having bearings G and M, respectively, upon the arm F, and beneath theseat-frame L, substantially as set forth.

SEBASTIAN HOFFMAN. Witnesses:

SAML. KNIGHT, CHARLES PIGKLES.

